* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0066FF;
    --primary-dark: #0052CC;
    --accent: #00D4FF;
    --bg-dark: #0A0E17;
    --bg-card: #111827;
    --text-white: #FFFFFF;
    --text-gray: #9CA3AF;
    --border: #1F2937;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 0.25rem;
    border-radius: 8px;
}

.tab-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-gray);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.tab-btn.active {
    background: var(--primary);
    color: var(--text-white);
}

.tab-btn:hover:not(.active) {
    color: var(--text-white);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    padding: 8rem 2rem 4rem;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        var(--bg-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 3px 12px;
    background: rgba(0, 102, 255, 0.1);
    border: 1px solid rgba(0, 102, 255, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 4px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-gray);
    max-width: 600px;
    margin-bottom: 3rem;
}

/* Features Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    width: 100%;
    margin-top: 2rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--primary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.5rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    text-align: center;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Tab Content */
.tab-content {
    display: none;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Code Section */
.code-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.code-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red { background: #FF5F56; }
.code-dot.yellow { background: #FFBD2E; }
.code-dot.green { background: #27C93F; }

.code-title {
    margin-left: 1rem;
    color: var(--text-gray);
    font-size: 0.85rem;
}

pre {
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

code {
    color: #E5E7EB;
}

.keyword { color: #C792EA; }
.string { color: #C3E88D; }
.function { color: #82AAFF; }
.comment { color: #546E7A; }
.number { color: #F78C6C; }

/* About Section */
.about-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.about-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 3rem;
}

.about-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.about-content p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-gray);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    /* Navigation */
    .nav-container {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
    }
    
    .logo {
        font-size: 1.1rem;
    }
    
    .nav-tabs {
        width: 100%;
        justify-content: center;
        margin-top: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    /* Hero */
    .hero {
        padding: 6rem 1rem 3rem;
        min-height: auto;
    }
    
    .hero h1 {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
        padding: 0 0.5rem;
    }
    
    .hero-badge {
        font-size: 0.75rem;
        padding: 4px 10px;
    }
    
    /* Features */
    .features {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 0.5rem;
    }
    
    .feature-card {
        padding: 1.25rem;
    }
    
    .feature-icon {
        width: 40px;
        height: 40px;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
    }
    
    .feature-card p {
        font-size: 0.85rem;
    }
    
    /* Tab Content */
    .tab-content {
        padding: 5rem 1rem 2rem;
    }
    
    /* Code Section */
    .code-section h2 {
        font-size: 1.5rem;
    }
    
    pre {
        padding: 1rem;
        font-size: 0.8rem;
        line-height: 1.6;
    }
    
    /* About Section */
    .about-section h2 {
        font-size: 1.5rem;
    }
    
    .about-content {
        padding: 1.5rem;
    }
    
    .about-content h3 {
        font-size: 1.2rem;
    }
    
    .about-content p {
        font-size: 0.9rem;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    /* Footer */
    footer {
        padding: 1.5rem 1rem;
        font-size: 0.8rem;
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }
    
    .hero-subtitle {
        font-size: 0.85rem;
    }
    
    .nav-tabs {
        gap: 0.25rem;
    }
    
    .tab-btn {
        padding: 0.35rem 0.6rem;
        font-size: 0.75rem;
    }
    
    .feature-card {
        padding: 1rem;
    }
    
    .feature-card h3 {
        font-size: 1rem;
    }
    
    .feature-card p {
        font-size: 0.8rem;
    }
}

ul { list-style: none; padding-left: 0; }
li { list-style: none; }

.about-content h3 {
  margin-top: 40px;
  margin-bottom: 20px;
}

.about-content p {
  margin-bottom: 20px;
}